#include<stdio.h>
#include<string.h>
#include<unistd.h>

int main()
{
    //C库函数
    printf("hello printf ");
    fprintf(stdout, " hello fprintf ");
    const char* message = " hello fwrite ";
    fwrite(message, 1, strlen(message), stdout);

    //系统调用
    const char* w = "hello write\n";
    write(1, w, strlen(w));
    fork();
    return 0;
}
